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//==========================================================================
//
//      strata.c
//
//      Flash programming
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    gthomas, hmt
// Contributors: gthomas
// Date:         2001-02-14
// Purpose:      
// Description:  
//              
//####DESCRIPTIONEND####
//
//==========================================================================
 
#include <pkgconf/system.h>
#include <pkgconf/hal.h>
#include <cyg/hal/hal_arch.h>
#include <cyg/hal/hal_cache.h>
 
#define  _FLASH_PRIVATE_
#include <cyg/io/flash.h>
 
#include "strata.h"
 
#define _si(p) ((p[1]<<8)|p[0])
 
extern void diag_dump_buf(void *buf, CYG_ADDRWORD len);
 
extern int strncmp(const char *s1, const char *s2, size_t len);
extern void *memcpy( void *, const void *, size_t );
 
int
flash_hwr_init(void)
{
    struct FLASH_query data, *qp;
    extern char flash_query[], flash_query_end[];
    typedef int code_fun(unsigned char *);
    code_fun *_flash_query;
    int code_len, stat, num_regions, region_size, buffer_size;
    int icache_on, dcache_on;
 
    HAL_DCACHE_IS_ENABLED(dcache_on);
    HAL_ICACHE_IS_ENABLED(icache_on);
 
    // Copy 'program' code to RAM for execution
    code_len = (unsigned long)&flash_query_end - (unsigned long)&flash_query;
    _flash_query = (code_fun *)flash_info.work_space;
    memcpy(_flash_query, &flash_query, code_len);
    if (dcache_on) {
        HAL_DCACHE_SYNC();  // Should guarantee this code will run
    }
    if (icache_on) {
        HAL_ICACHE_DISABLE(); // is also required to avoid old contents
    }
 
    stat = (*_flash_query)((unsigned char *)&data);
    if (icache_on) {
        HAL_ICACHE_ENABLE();
    }
 
    qp = &data;
    if ( (qp->manuf_code == FLASH_Intel_code)
#ifdef CYGOPT_FLASH_IS_BOOTBLOCK
         // device types go as follows: 0x90 for 16-bits, 0xD0 for 8-bits,
         // plus 0 or 1 for -T (Top Boot) or -B (Bottom Boot)
         //     [FIXME: whatever that means :FIXME]
         // [I think it means the boot blocks are top/bottom of addr space]
         // plus the following size codes:
         //    0: 16Mbit    2:  8Mbit    4:  4Mbit
         //    6: 32Mbit    8: 64Mbit
#if 16 == CYGNUM_FLASH_WIDTH         
         && (0x90 == (0xF0 & qp->device_code)) // 16-bit devices
#elif 8 == CYGNUM_FLASH_WIDTH
         && (0xD0 == (0xF0 & qp->device_code)) // 8-bit devices
#else
         && 0
#error Only understand 16 and 8-bit bootblock flash types
#endif
        ) {
        int lookup[] = { 16, 8, 4, 32, 64 };
#define BLOCKSIZE (0x10000)
        region_size = BLOCKSIZE;
        num_regions = qp->device_code & 0x0F;
        num_regions >>= 1;
        if ( num_regions > 4 )
            goto flash_type_unknown;
        num_regions = lookup[num_regions];
        num_regions *= 1024 * 1024;     // to bits
        num_regions /= 8;               // to bytes
        num_regions /= BLOCKSIZE;       // to blocks
        buffer_size = 0;
#else // CYGOPT_FLASH_IS_BOOTBLOCK
         && (strncmp(qp->id, "QRY", 3) == 0)) {
        num_regions = _si(qp->num_regions)+1;
        region_size = _si(qp->region_size)*256;       
        if (_si(qp->buffer_size)) {
            buffer_size = CYGNUM_FLASH_DEVICES << _si(qp->buffer_size);
        } else {
            buffer_size = 0;
        }
#endif // Not CYGOPT_FLASH_IS_BOOTBLOCK
 
        flash_info.block_size = region_size*CYGNUM_FLASH_DEVICES;
        flash_info.buffer_size = buffer_size;
        flash_info.blocks = num_regions;
        flash_info.start = (void *)CYGNUM_FLASH_BASE;
        flash_info.end = (void *)(CYGNUM_FLASH_BASE +
                        (num_regions*region_size*CYGNUM_FLASH_DEVICES));
#ifdef CYGNUM_FLASH_BASE_MASK
        // Then this gives us a maximum size for the (visible) device.
        // This is to cope with oversize devices fitted, with some high
        // address lines ignored.
        if ( ((unsigned int)flash_info.start & CYGNUM_FLASH_BASE_MASK) !=
             (((unsigned int)flash_info.end - 1) & CYGNUM_FLASH_BASE_MASK ) ) {
            // then the size of the device appears to span >1 device-worth!
            unsigned int x;
            x = (~(CYGNUM_FLASH_BASE_MASK)) + 1; // expected device size
            x += (unsigned int)flash_info.start;
            if ( x < (unsigned int)flash_info.end ) { // 2nd sanity check
                (*flash_info.pf)("\nFLASH: Oversized device!  End addr %p changed to %p\n",
                       flash_info.end, (void *)x );
                flash_info.end = (void *)x;
                // Also adjust the block count else unlock crashes!
                x = ((cyg_uint8 *)flash_info.end - (cyg_uint8 *)flash_info.start)
                    / flash_info.block_size;
                flash_info.blocks = x;
            }
        }
#endif // CYGNUM_FLASH_BASE_MASK
 
        return FLASH_ERR_OK;
    }
#ifdef CYGOPT_FLASH_IS_BOOTBLOCK
 flash_type_unknown:
#endif
    (*flash_info.pf)("Can't identify FLASH, sorry, man %x, dev %x, id [%4s] stat %x\n",
           qp->manuf_code, qp->device_code, qp->id, stat );
    diag_dump_buf(qp, sizeof(data));
    return FLASH_ERR_HWR;
}
 
// Map a hardware status to a package error
int
flash_hwr_map_error(int err)
{
    if (err & FLASH_ErrorMask) {
        (*flash_info.pf)("Err = %x\n", err);
        if (err & FLASH_ErrorProgram)
            return FLASH_ERR_PROGRAM;
        else if (err & FLASH_ErrorErase)
            return FLASH_ERR_ERASE;
        else 
            return FLASH_ERR_HWR;  // FIXME
    } else {
        return FLASH_ERR_OK;
    }
}
 
// See if a range of FLASH addresses overlaps currently running code
bool
flash_code_overlaps(void *start, void *end)
{
    extern char _stext[], _etext[];
 
    return ((((unsigned long)&_stext >= (unsigned long)start) &&
             ((unsigned long)&_stext < (unsigned long)end)) ||
            (((unsigned long)&_etext >= (unsigned long)start) &&
             ((unsigned long)&_etext < (unsigned long)end)));
}
 
// EOF strata.c